Specifications

Installation and Start-up 7-31

Alarm Output Connection

Dry contact relay closures are available for forwarding MGX 8220 alarms to a user office alarm

system. Separate visual and audible alarm outputs are available for both major and minor alarm

outputs. The MGX 8220 alarm outputs are available from a DB15 connector on the BNM line

module faceplate. Refer to Appendix B, “Specifications”, for the pinouts on this connector. Use

switchboard cable for running these connections.

Making External Clock Connections

If the MGX 8220 node is to be synchronized to some other external equipment or a local digital

central office, a connector on the back card can be used to provide a clock input.

For a T1 clock input, the DB15 connector marked EXT TMG on the T3E3-D or SMF-155 line

module is used.

For a E1 clock input, the BNC connector marked EXT TMG on the T3E3-B or SMF-155 line module

is used.

Attaching a Control Console

The control console can be attached to either the maintenance port or to the control port.

Dumb Terminal onto the Maintenance Port

When using an alpha-numeric (dumb) terminal to input Command Line Interface commands, the

terminal must be connected directly (no modem) to the maintenance port DB25 connector on the

ASC line module faceplate. Use a conventional RS-232 cable with a DB25 connector at each end.

A so-called “Null Modem” cable is not required. This port should never be Y-cabled.

Workstation onto the Control Port

When using a workstation to issue commands or transfer files to and from the shelf, the workstation

can be attached through the RS-232 control port on the ASC line module faceplate. Using this

connection requires the workstation to communicate using TCP/IP and SLIP communication

protocols.

The workstation can be attached either directly with no modems or remotely through modems. In

either case, a conventional RS-232 modem cable should be used.

If the shelf has dual redundant ASC modules, use a Y-cable to connect the workstation or modem to

the control port of both the ASC modules. If a modem is used, a null-modem cable is required.

Initial Start-up of the MGX 8220 Shelf

Before applying power to the MGX 8220 shelf, check the following items:

1 Shelf is properly grounded.

2 AC or DC power sources are properly installed and connected.

3 All the cards are in their proper slots and are locked in place.